Socket lining and method of making same



Dec. 15, 1931. 1.. D. CHRISTIE 1,836,360

SOCKET LINING AND METHOD OF MAKING SAME Fild Jan. 18, 1929 INVENTCR g OQ M ATTORNEY 5 Anotherobject of my inventio vide a socket lining having an interior layer 1 made of asbestos, and anouter layer madeof Patented Dec. 15, 1931 N En TATES LEWIS n. CHRISTIE, OFTBUMBULL, CONNECTICUT socKErLININe AND mn'rnon OF MAKING SAME Application filed January 1a, 1929. Serial mi. 333,480.

My invention relates to a new and improved method of manufacturing an electrio-light socket lining, and to a new and improved socket lining. j

' One of the objects of my invention is to provide a socket lining which shall have hlgh resistance to the action of heat so that the said lining will notcarbonize and become brittle when it is heated.

Another object of my invention is to pro vide a simple and efficient method of providing an insulating socket"lining for the sockets of incandescent electric-lamps. V

Anotherobject of my invention is to provide a socket lining for this purpose Which shall include asbestos or asbestos paper in a new and improved form.

. paper such as kraft paper.

into the finalshape.

Otherobjects of my'invention will be set forth in thefo'llowing description and draw.-

ings-which illustrate a preferred embodiment 1 thereof, it being understood that the above general statement of the objects of 'my invention is intended to generally explainthe same and not to limit it in any manner.

Fig; 1: is an elevation showing a" strip of paper employed for making the improved lining. g

Fig. 2 is a view similar-to Fig. 1 showing a sheet of asbestos paper utilized for making the interior layer of the socket.

Fig. 3 shows howth'e sheets Ofmaterial illustrated in Figs. 1 and2 are glued together. I

Fig. 4 is an end view of the composite material shown in Fig. 3. j

Fig. 5.is a sectional view of the. spiral tube which is rolled from the'composite material. This spiral tube is formed ofaplural ity of parallel layersofcomposite material.

7 Fig. 6 is a vertical sectional view of the 1 tube which is. rolled from the coinpositemat'erialk V V 7 is a vertical sectional view showing how the tube illustrated in Fig. [6 is formed 1 is to pro '8 is an elevation of the completed socket lining.

The sockets used for holding incandescent electric lamps must have an insulator" lining between the outer socket shell, and the'inner M screw shell which carries the electrical-com nections. When the incandescent lampshave a high candle power so that the temperature ofthe socket is correspondingly raised, the heat causes the ordinary paper linings to carbonizeandbecome brittle andfall out of position, so that the insulating protection is injured or destroyed. f j I; Asbestos paper can; withstand the high temperature but it is toobrittle to be formed into linings, and in additionyit has other properties which make it difficult to form a lining therefrom.

According to my invention, a sheet of suitable paper 1, such as manilla paper or what is known in the trade as kraft paper isfasteneid by means ofa suitable adhesive, or by any other means, to a sheet ofasbestos paper 2. As shown by the stippled lines G, the grain ofsaid paper is preferably parallel to 7 the long side thereof. I The tubes which are later mentioned may be formed from the sheet of composite material shown in Fig. 3, which is 15 inches long and 12 inches wide. If desired, the edges of the long sides of-both "sheets of: material may be extended beyond is 15 inches long andit has a diameter which is equal tothe diameter ofthe widest part of the finished socket. .The diameter of the widest part of the lfinished socket. is V ordinarily 1 inches and the diameter of the narrowest portion is. ordinarily about 1% inches. The tubes are formed by means of any suitable tube-rolling'machine. which is not shown in thedrawings, asin itself such machine is old and well known. Such'in'achines ordinarily have a pair of-paste rolls through which the composite sheet passes,

iorgparelleltto .theaxis of-the lining.

and revolving shaft on which the paper is rolled. The advantage of causing the thin edge of the asbestos paper to overlap the edge of the kraft paper is that the thin edge of the asbestos paper will start to quickly roll up into tube form as soon as it meets the revolving-shaft. The kraft paper has a chamtei'ed :or declcle e e to make a smooth and almost invisible seam. The asbestos paper in the interior of the tube covers and protects-theedge of the =kraft paper. The tube T which is thus rolled and which is 15 inches long,"is cut into any suitable number of shorter .tubes. Ordinarily, these tubes are 2 inches high, some allowance being zmadewfor* waste,.=so-that seven tubes are cut from the tube which has been rolled. llhe section %l"- which has thus beenxcut from theulongtu-bei-El is RO'WIPltLCGClRllPOl] a pinP whose-shape corresponds-to the shape of the iinishedsooket linings. An outer :die member iD- is now rfOI'CGCl downwardly upon. the section :51- asillustrated inrFig. 7. This conttacts-mnd crimps the upper portion :ofthe section T soasto form the completedarticle shown inlligfl. :Thisoperation may beper- .tomned while'thesection .I" is at ordinary room temperature.

Thetexteriorof the contracted portion of .thewtubexis ;quite;smooth. It would be i1npossible-to-directlyureduce the diameter of a tube f-onmed: from asbestos alone because. the asbestos has fibre which is so weak,that1such .fibrenwou-ld be .forced downwardly-by the .dieuinstead -of passing through the die tobe compressed 'iiitothe smaller diameter re quired. iHowever, the improved lininghas the :asbestos .material wsubstantially undistorted inaa direction which is longitudinal, That is, the :asbestos material forms the internal wwall'of' .the: lining, instead o1": being-"carried through-.thewdie. I do not wishitoexclude from the scope ofuthe inventiona lining in 4;, whichztheiasbestos material mayhave been somewhat distorted in aldi-rection parallel tovtlieraxisnas itzissullicient. if the asbestos the socket Zlining. sas' thezxoutside :layer =-of theltube section, the

material wfonms -*a= eontinuousinner wall .01 By usingsaid paper diameterlthe-reof can'bereduced, and the reduced portion can be oompressed into the propershape. I preierto have or the weightof the socket S consisting 'of'the asbestos, "the remaining 40% consisting of said paperfwhich"forms the outside layer g itetube secttion to die-rapidlyand efficiently reduced-an diameter.

L. It is likewise desirable to-have the :diewofk performed-: directly on said paper 'becauseuthe prising asbestos and-an outer face layer made of non-asbestos material which can be read- 'iiy "compressed and shaped by means of a die. The use of the asbestos and paper, in the proportions above mentioned, produces a-socket liningwhichis *very. fiexibleso that it may be subjected to heavypressurewwithout being injured. In this respect, the article made accordingito mylnventionis superior to that made of fiber 'because'the Iiber linings are-brittle.

'IV-hile I have illustrated .a preferred method for making the completed socket lining, I do not wish that the claims-for the article of manufacture should betlimited to the method disclosed herein.

I have shown. .a preferred embodiment of my invention, but itis clear that numerous changes and omissions could be made with out departing from the spirit ofmy invention.

I claim:

\ 1. .A tubular andflexible lining tor the socket of-an incandescent lamp, said lining having longitudinally disposedportions of different diameter, said lining beingrmade of a 'composite material which includes asbestos sand bendable. non--asbestos material, the. face? layer ofsaid lining beingzmade of .saidnon-asbestos 'material, one end portion of said lininguhaving a smaller lateral-diameter than theother" end. portion .of said lining, the end. portion of said lining which "liasrthe smaller diameter being inwardly'and laterally compressed, theasbestos in said'end portion of smaller diameter being substantially. undistorted-in a direction 21381111161 to the axis otthe lining.

2. A tubular .andl-flexible lining for .the

socketof: anuinca-ndescent lamp,.-said lining lining.

portionsof difl'erent diameten'said lining bew ing made of composite material which includes asbestos, the outside layer of said lining being made of paper whose grain is substantially parallel to. the longitudinal axis of the lining, the portion of said lining which has the smaller diameter being inwardly and laterally compressed, the asbestos in said end portion of smaller diameter beingsubstantially undistorted in a direction parallel to the axis of the lining.

4. A tubular lining for the socket candescent lamp, said lining being formed of a spirally wound composite sheet which includes asbestos and non-asbestos material, one end of said lining being laterally and inwardly compressed, the asbestos in said end portion being substantially undistorted in a direction 5. A tubular lining for the socket of an incandescent lamp, saidlining being formed of a spirally wound composite sheet which includes asbestos and paper, the face layer of said lining consisting of paper, one end of said linin being laterally and inwardly compressed, t e asbestos in said end portion being substantially undistorted in a'direction parallel to the axis of the tubular lining.

In testimony whereof I aflixmy signature.

LEWIS D. CHRISTIE.

of an in parallel to the axis of the tubular 

